JPH0366918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application Regarding the operating structure of a washing machine according to the present invention, the present invention proposes an improvement in the structure of a lid switch when operating control of a washing machine is computerized.

Configuration of conventional examples and their problems Regarding the lid switch of a washing machine that performs electronic operation control, there is an example such as the one proposed in Japanese Patent Application Laid-Open No. 57-131487 (Japanese Patent Application No. 16309-1982). be.
In the above example, one "leaf switch" is used to control the dehydration operation OFF-ON by opening and closing the lid of the washing machine, and to detect the unbalanced distribution of clothes in the washing and dehydration tank using the safety lever. It consists of a single switch with a "push-up piece". FIG. 1 shows the configuration of the safety switch of the above example. Reference numeral 1 denotes a leaf switch, which is fixed to a base 2 with screws 3. When the lid 4 is closed, the lid lever 5 is pushed up, and the unbalanced lever 6 is accordingly displaced upward, and the push-up piece 8 is pushed up by the push-up portion 7 at the tip of the leaf switch 1 into the pusher 9 of the leaf switch 1.
is turned on by pushing up. The unbalanced lever 6 has pressing springs 10 and 11 inserted between the base 2 and the lid lever 5, so that the lid lever 5 is attached to the base 2, and the unbalanced lever 6 is attached to the lid lever 5 in one direction. giving strength.

In the conventional configuration as described above, there were problems to be solved, such as the large number of parts, which required a lot of assembly man-hours, and reliable operation could not be ensured unless the accuracy of each part was required. That is, for example, in the above example, the operation of the unbalanced lever 6 is influenced by the lid lever 5 supported by the base 2, and
Since the operating lever 8 is held by the base 2, the operation of the presser 9 is affected by the cumulative result of dimensional variations of each part. Therefore, new adjustment work is required, such as adjusting the attachment of leaf switch 1 to base 2 using screw 3, and the difference in abnormality detection (i.e. time difference) due to opening/closing of the lid and unbalanced operation is large. , was difficult to do with certainty.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and provides an extremely simple structure and low cost for turning on and off the energization signal by opening and closing the lid, and detecting abnormalities during unbalanced operation.

Structure of the Invention The present invention has a lid lever that rotates when the lid is opened and closed, and an L-shaped portion that faces the outer periphery of the upper part of the aquarium.
It consists of a safety lever that is vertically displaced by the operation of the lid lever, and a movable body that presses the end of the movable contact piece of the switch to which the fixed contact piece and the movable contact piece are fixed,
This movable body is rotatably supported on a part of the safety lever, and is slidably supported in the vertical direction on a base plate that supports the switch body and rotationally supports the safety lever. An elastic body is interposed between the safety lever and the safety lever by the biasing force of the elastic body.

DESCRIPTION OF EMBODIMENTS FIGS. 2 and 3 are cross-sectional views of a lid switch showing an embodiment of the present invention, and FIG. 4 is an operational diagram of a movable body part.
FIG. 5 shows an exploded perspective view. FIG. 2 shows the washing machine with the lid 21 closed. The lid lever 24, which has a locking element 23 fixed to its tip by an operating protrusion 22 projecting rearward of the lid 21, is rotatable clockwise in FIG. 2 about a bearing 26 formed on a switch base 25. Supported by The lid lever 24 can be easily processed by manufacturing it from steel wire or the like. The switch base 25 is made of an insulating plastic material, and the fixed contact piece 27 and the movable contact piece 28 are integrally molded. In particular, the movable contact piece 28 is made of a flexible material such as a thin copper plate or a stainless steel plate. Since FIG. 2 shows the state in which the lid 21 is closed as described above, the fixed contact piece 27 and the movable contact piece 28 are shown in FIG.
is in the ON state. In order to turn on the same state, the safety lever 29 is moved upward using the lid lever 24, and the above-mentioned movable piece 28 is moved at one end of the movable body 30 rotatably supported on the upper end of the safety lever 29. The tip L-shaped bent portion 28' is pressed. A part of the movable body 30 is rotatably supported by the safety lever 29, and a part of the movable body 30 is freely supported by the safety lever 29. It is made of an electrically insulating material, such as a synthetic resin material, on which a slide protrusion 33 to be fitted is formed. The above-described switch base 25 is fixed to the substrate 31, and the safety lever 29 is rotatably held by a protruding piece 34 at the end on the side of the lid 21. A pressing coil spring 37 is inserted between the protrusion 35 on the outer bottom surface of the board 31 and the protrusion 36 of the safety lever 36, and while pressing the safety lever 29 downward against the board 31 with this one coil spring 37, The clockwise rotational urging force is maintained. When the lid 21 is opened, the lid lever 24 rotates counterclockwise around the bearing 26 and the safety lever 29 also moves downward, so the movable body 30 moves downward along the irregularly shaped hole 32. The urging force that presses the movable contact piece 28 upward is released, and the lid switch is therefore turned off.

FIG. 3 shows a case where the clothes are largely eccentric in the spin-drying/washing tub (not shown) and are in a spin-drying state, and the water tub (not shown) presses the unbalance lever 29 in the direction of arrow A. At this time, the safety lever 29 rotates counterclockwise about the protruding piece 34 of the base plate 31 against the pressing force of the coil spring 37, and further moves the movable body 30 slightly to the left as shown in FIG. Make it move. At this time, the movable body 30 moves clockwise relative to the safety lever 29 while slightly moving inside the irregularly shaped hole 32 of the board, and the bent portion 2 of the movable contact piece 28 moves clockwise.
8' moves downward and becomes OFF.

This operation will be explained with reference to a detailed enlarged view of FIG. 4. Figure 4 a shows the lid open state, that is, the contact between the contacts is OFF.
Indicates a state where . FIG. 4b shows a state in which the lid is closed, that is, contact pieces 27 and 28 are turned on. Movable body 3
0 presses the movable contact piece 28 with its right end 38.
FIG. 4c shows a case where the unbalanced lever 29 is operated, and the movable body 30 has its shaft support 40 moved to the left by the unbalanced lever 29, and the right end tongue piece 3
The tip of the movable contact piece 28 sinks into the recess 41 provided at 8, and the movable contact piece 28 moves downward and is temporarily turned off.
state. The unbalanced lever 29 is the second and third
As shown in the figure, it can be rotated clockwise by a pressing coil spring 37, and even if the movable piece moves into the recess 41, it immediately returns to the state shown in FIG. 4b.

Operation OFF-ON control when the lid of the washing machine is opened and closed is performed by the operations shown in FIGS. 4a and 4b.

Unbalance abnormality detection is performed by the operations shown in FIGS. 4b and 4c.

In an electronically controlled lid switch, as mentioned above, it is necessary to make a large difference between the opening and closing of the lid and the opening and closing of the contacts caused by the operation of the unbalanced lever. This means that when the user opens and closes the lid quickly, for example, it is necessary to lengthen the contact OFF-ON time when the lid is opened and closed so that the user does not mistakenly think that an imbalance has been detected. In the present invention, the shape of the movable body 30 is changed when the lid is opened/closed and when the unbalanced lever is operated.
This is effectively achieved by supporting the movable body using the zero shape and an unbalanced lever. FIG. 5 is an exploded view of the lid switch section.

As mentioned above, the movable body is made of electrically insulating plastic material by molding into a substantially U-shaped planar shape, and includes a convex portion 4 formed on the side surface of the safety lever 29.
2, the small hole 43 provided in the U-shaped arm portion 43 is loosely fitted and supported rotatably, and the protrusion 33 provided in the arm portion 43 is inserted into the linear hole 32 formed in the substrate 31 described above. It is loosely fitted so that it can slide up and down. This attachment takes advantage of the flexibility of the plastic of the movable body 30.

The lid lever 24 passes through a small support hole 45 formed in the safety lever 29, and its rear end is rotatably held by inserting an L-shaped bent portion 46 into a bearing portion 26 integrally provided on the switch base 25. Ru.

Effects of the Invention As described above, according to the present invention, the movable body that causes the ON/OFF operation of the movable contact piece of the lid switch is pivotally supported at the tip of the safety lever, and is also slidably and loosely fitted to the base plate of the switch. At the very least, since it is designed to prevent it from coming off, the operation is simple and the number of parts can be significantly reduced.Also, since the elastic body that biases the safety lever is also used to bias the lid lever, The number of elastic bodies can be reduced and assembly work efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional lid switch, and FIG. 2 is a sectional view of a lid switch showing an embodiment of the present invention.
FIG. 3 is a sectional view of the lid switch in its operating state, FIGS. 4a, b, and c are sectional views of essential parts showing the operating state of the lid switch, and FIG. 5 is an exploded perspective view of the lid switch. 24... Lid lever, 28... Movable contact piece, 29...
...safety lever, 30...movable body, 31...board,
32... Unusual hole, 33... Protrusion of movable body, 42...
...Safety lever protrusion.

Claims (1)

[Claims] 1. A switch with a lid lever that rotates when the lid is opened and closed, a safety lever that has an L-shaped part facing the outer periphery of the upper part of the aquarium and that moves up and down according to the operation of the lid lever, and a fixed contact piece and a movable contact piece that are fixed. It consists of a movable body that presses the end of the movable contact piece, and this movable body is rotatably supported on a part of the safety lever, and is attached to a base plate that supports the switch body and rotationally supports the safety lever. , is supported so as to be slidable in the vertical direction, and an elastic body is interposed between the safety lever and the board, and the safety lever is moved downward by the biasing force of this elastic body.
A lid switch for a washing machine configured to be biased toward the water tank.